Question

find the sum of the infinite geometric series: 5-(5)/(3)+(5)/(9)-(5)/(27)...

Answer 1

i get 100/27 but that cant be right b/c thats not an answer choice

Answer 2

sum of infinite gp = a/1-r
a-first term
r-common ratio
Here a = 5
r=(-1/3)

Answer 3

solve it, you get 15/4 i.e 3 3/4.